pi = C / d C = pi times d d = C / pi
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Divide the known circumference by pi to find the diameter of the circle.
It is NOT a formula but an EQUATION . The answer is C = pi*d This equation has been known for thousands of years. It can also be in the form of C = 2 pi r NB 2r = d Also A = pi r^(2) for the area of a circle.
If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
Multiply the known diameter by the value of PI - and you'll have your answer !
It depends on what "this measurement" refers to: the radius, circumference, length of arc with a known angle.